Yüzüak, Ercüment; Yüzüak, Gizem Durak; Dinçer, İlker; Elerman, Yalcin

This paper provides a comprehensive and comprehensible analysis of the conversion of magnetic energy in magnetocaloric materials, as well as the application of magnetic refrigeration that relies on the magnetocaloric effect. The magnetocaloric effect (MCE) refers to the phenomenon of cooling or heating that takes place in a magnetic material when an external magnetic field is introduced or removed under adiabatic conditions. This effect also occurs in reverse, when the application or removal of an external magnetic field induces cooling or warming in the material. For a considerable period, the phenomena referred to as “adiabatic demagnetization” has been recognized, wherein the practical use of the magnetocaloric effect (MCE) in magnetic materials is observed. Magnetic materials exhibit the phenomenon known as the magnetocaloric effect close to their critical temperature. The magnetocaloric system exhibits superior environmental friendliness and efficiency compared to conventional refrigeration cycle systems that rely on vapor compression. Magnetic refrigeration is a cooling system that operates by utilizing the magnetocaloric effect. This methodology can be employed to achieve reduced temperatures, including those within the typical operational range of conventional refrigeration systems. In the realm of magnetic and electromagnetic energy conversion, the system's coefficient of performance (COP) attains a theoretical efficiency of 30%–60% of the Carnot cycle. The exploration of magnetic refrigeration is now underway, with a focus on utilizing low magnetic fields in the vicinity of room temperature. The objective is to facilitate the development of commercial devices that employ permanent magnets as the primary source of magnetic field. The utilization of a magnetocaloric heat pump in a magnetic refrigerator is employed as a cooling mechanism, relying on magnetocaloric materials. These materials present a promising substitute for conventional refrigeration technology that relies on compressors. Theoretical investigations have indicated that refrigeration systems utilizing the magnetocaloric effect have the potential to achieve energy efficiency levels that are around 35% higher compared to vapor compression systems. In addition, it should be noted that cooling systems utilizing magnetocaloric materials exhibit reduced noise levels as a result of the lack of a compressor. This particular technological approach involves the utilization of coolants that are water-based, as opposed to the conventional use of gaseous refrigerants.

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